<!doctype html> 
<html> 
<head> 
    <meta charset="utf-8"> 
    <title></title> 
</head>
<body>
<script type="text/javascript">
	
json = {
	'a':new String('123'),
	'b':function(){
		this.c = this.a;
		this.c.b = 10;
	}
};
json.b();
alert(json.a.b);



</script>
</body>
</html>